'It's the one area where I have more experience!' Allison Williams jokes with Samuel L Jackson about the VERY awkward side of sex scenes

In the 45 years since Samuel L Jackson made his feature film debut he's become a hugely experienced star of stage and screen.

But there is one area in which Girls star Allison Williams, 28, can school the veteran actor - sex scenes.

Having filmed multiple couplings during her time as Marnie, the actress showed her experience as the pair were interviewed on Thursday night's edition of Watch What Happens Live.

'It's the one area where I have more experience!' Allison Williams chats with Samuel L Jackson about the VERY awkward side of sex scenes

Opening up: Having filmed multiple couplings during her time as Marnie, the actress showed her experience as the pair were interviewed on Thursday night's edition of Watch What Happens Live

The two were asked to answer a viewer's question, about whether it was flattering for an actress if an actor became aroused during a sex scene.

Allison replied: 'It is flattering but upsetting when it happens, and it is also upsetting and unflattering when it doesn’t happen. So the best case scenario is kind of like a suggestion of excitement without the actual physical manifestation of it.'

And she added: 'It is so awkward, trust me.'

What an ask: The two were answering a viewer's question, about whether it was flattering for an actress if an actor became aroused during a sex scene

Awkward! With multiple TV couplings under her belt, Allison knows what she's talking about

Admitting that he had only done 'about three [sex scenes] in my life,' Jackson had a few questions for Allison

Admitting that he had only done 'about three [sex scenes] in my life,' Jackson had a few questions for Allison.

'Do they wear socks?' he asked, referring to a small sack used to protect an actor's modesty, while giving the appearance of nudity.

'Yeah, they have to wear the little sack thing, yeah,' said Allison.

She's been there:Allison Williams played the character of Marnie in Girls for six seasons

Intense: Sexually active Marnie regularly stripped off for the scenes

Multiple partners: Viewers became used to seeing her in varying states of undress

Not as easy as it looks: Allison admitted the scenes were always 'awkward'

Realising she had filmed more sex scenes than 68-year-old Samuel , Allison quipped: 'We found the one way I have more experiences than you'

'See, I always apologize first,' said Jackson. 'I’ll say, ‘I’m sorry if I do and I’m sorry if I don’t… That generally works.'

Realising she had filmed more sex scenes than the 68-year-old, Allison quipped: 'We found the one way I have more experiences than you.'

Not so experienced: Jackson with Naomi Watts; he admitted: 'I don’t do sex scenes that often'